Rockwell Hardness Of Pins Of A Certain Type Is Known To Have A Mean Value Of 50

1.3

(a) If the distribution is normal, what is the probability that the sample mean hardness for a random sample of 12 pins is at least 51?

(b) What is the (approximate) probability that the sample mean hardness for a random sample of 45 pins is at least 51?

Prof. Angela

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